msm: mdss: share fb memory ion fd to userspace

Add new operation request to share ion fd to userspace
for mapping to the frame buffer memory.

Change-Id: I404c73c19e3fffec593ffd32c34e7b1a74a500d8
Signed-off-by: Jeevan Shriram <jshriram@codeaurora.org>

Patchset: 1
http://review.cyanogenmod.org/#/c/73823/

Dependent on

http://review.cyanogenmod.org/#/c/73824/

https://github.com/slayher/proprietary_vendor_samsung/commit/b6b08aea3ed7c3d346144c48ddd16fcfa68e8dc9